ipv6: Fix leak in ipv6_gso_segment().

If ip6_find_1stfragopt() fails and we return an error we have to free
up 'segs' because nobody else is going to.

Fixes: 2423496af35d ("ipv6: Prevent overrun when parsing v6 header options")
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Gbp-Pq: Topic bugfix/all
Gbp-Pq: Name ipv6-fix-leak-in-ipv6_gso_segment.patch

diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 013086b248e2621d5479d1428e3e1b1e4f21ea05..424fbe1f897811b89ca893d3d56f82b08c96418a 100644 (file)
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -116,8 +116,10 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
 
                if (udpfrag) {
                        int err = ip6_find_1stfragopt(skb, &prevhdr);
-                       if (err < 0)
+                       if (err < 0) {
+                               kfree_skb_list(segs);
                                return ERR_PTR(err);
+                       }
                        fptr = (struct frag_hdr *)((u8 *)ipv6h + err);
                        fptr->frag_off = htons(offset);
                        if (skb->next)